Thank you Mahdi! I highly recommend trying a hand at switched mode power supply design; it will teach you a lot!
On Wed, Nov 20, 2019, 12:09 PM Mahdi Al Husseini <[email protected]> wrote: > Tremendous respect Michael. I am currently redesigning a boost converter > using a LM3478. It’s a surprisingly involved process, especially if not > well acquainted with power circuitry. I’ve found that, between refinement > of component values and board layout design, it’s very much an art and > science. Really liked the write up. Keep up the good work. > > On Wed, Nov 20, 2019 at 10:35 AM Richard Scales <[email protected]> > wrote: > >> I tried the first two suggestions and thought (initially) that all was >> good but upon watching in detail it would seem that it is the same. >> >> I have a L78M05 to hand - is that going to do the job? >> >> Otherwise I can get something like this >> https://uk.rs-online.com/web/p/low-dropout-voltage-regulators/1246447/ very >> quickly. >> >> >> >> On Wednesday, 20 November 2019 15:33:20 UTC, Kevin A. wrote: >>> >>> Here would be my first 2 suggestions in changes to your circuit: >>> >>> #1: I would definitely place the ground from my logic circuits straight >>> to the main power ground, instead of routing it though the 5V buck module. >>> The buck converter is also a switching power supply and this could very >>> well be coupling noise through the rest of your circuit, especially if it >>> is the only ground path for the logic. >>> >>> #2: If #1 does not fully alleviate the problem, I would try placing an >>> electrolytic cap of between 100-470uF on the 5 volt rail close to the logic >>> circuits. This could help decouple the logic from any noise entering >>> through the 5V rail. >>> >>> Finally, if the above two do not solve the problem, I would use a linear >>> regulator after the 5V module to provide a clean 5 volts to your logic >>> circuits. It looks like the 5V module has a trim pot on it, so I would >>> increase the voltage to 6 or 7, and then use a 5 volt LDO (low dropout >>> regulator) to provide the final 5 volts. This certainly will alleviate a >>> large amount of noise on this line that you might not even be able to >>> observe on your scope, unless you zoom in quite a bit on the vertical >>> (voltage) scale (so that you're looking at hundreds or even tens of >>> millivolts per division). >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/7e183735-7ca9-4287-8cc8-51e22a65d43f%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/7e183735-7ca9-4287-8cc8-51e22a65d43f%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAO97pxUGq5Uke44Z0%3Db6ZncZRmryiREerCvmLV4oqr4OCRJYsg%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAO97pxUGq5Uke44Z0%3Db6ZncZRmryiREerCvmLV4oqr4OCRJYsg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CALcVLK%2Br4m%3DZ0eagikLWh%2B2QTL17BEuGnyn7XDUE7Y3n-cc-6w%40mail.gmail.com.
